Effect of Sintering Temperature on the Properties and Leaching of Incinerator Bottom Ash
Effect of Sintering Temperature on the Properties and Leaching of Incinerator Bottom Ash
复制标题
烧结温度对焚烧炉底灰性能及浸出的影响
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
C. Sollars
中科院分区：
文献类型：
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作者：
S. Bethanis;C. Cheeseman;C. Sollars
城市生活垃圾焚烧炉底灰的细颗粒大小往往是有问题的，因为这种材料的再利用应用是有限的。在这些实验中，采用传统的陶瓷生产技术，包括湿磨、干燥、压实和烧结，处理粒径小于8毫米的焚烧炉底灰。本文报道了烧结温度对烧结密度、微观结构、酸中和能力（ANC）和金属离子释放随渗滤液pH值的变化的影响。在1080℃烧结得到的样品密度最大。该材料主要晶相为透辉石（CaMgSi2O6）、斜辉石（Mg2Si2O6）和硅灰石（CaSiO3）。烧结样品的酸中和能力明显低于磨底灰，并随着烧结温度的升高而进一步降低。这与在所有渗滤液pH条件下烧结灰样品中Ca的浸出减少有关。在焚化炉底灰中存在的重金属有Cr、Cu、Ni、Zn、Cd和Pb。在最佳条件下烧结降低了这些金属在强酸性条件下（pH为3）的可浸出分数，其影响因素从Ni的90%到Cr， Cd， Zn和Pb的大于99%不等。
The fine particle size fraction of municipal solid waste incinerator bottom ash is often problematic because reuse applications for this material are limited. In these experiments incinerator bottom ash with a particle size of less than 8 mm was processed using conventional ceramic production techniques involving wet milling, drying, compacting and sintering. The effect of sintering temperature on the sintered density, microstructure, acid neutralization capacity (ANC) and the release of metal ions as a function of leachate pH are reported. Sintering at 1080 °C produced samples with maximum density. This material contained diopside (CaMgSi2O6), clinoenstatite (Mg2Si2O6) and wollastonite (CaSiO3) as the major crystalline phases. The acid neutralization capacity of sintered samples is significantly lower than milled bottom ash, and further reduces as the sintering temperature increases. This is associated with reduced leaching of Ca from sintered ash samples under all leachate pH conditions. Heavy metals present in the incinerator bottom ash included Cr, Cu, Ni, Zn, Cd and Pb. Sintering under optimum conditions reduced the leachable fraction of these metals under aggressive acid conditions (leachate pH 3) by factors ranging from 90% for Ni to greater than 99% for Cr, Cd, Zn and Pb.